[sdiy] RC filter questions + SPICE RC filter simulation questions

[Richard Atkinson]

That will sound a bit like a diode ladder filter. Without any buffering 
after the RC circuits, each one is loaded by the one that follows it.

Can you put up some plots showing the frequency response, and in particular 
the bump you refer to?


On Apr 16 2010, cheater cheater wrote:

>Hi guys,
>I have been playing around with pspice today, simulating and analyzing
>some very simple circuits.
>
>I analyzed a simple RC filter: AC voltage source goes through R=1kR
>and C=1uF to ground. I analyzed it and got the familiar curve.
>
>Then I stuck some more stages like that on it: there's a series of
>four 1kR resistors and after each one there's a 1uF cap to ground. I
>analyzed it and got the expected curve at the last stage, but the
>first stage has a distinctive bump. Additionally the cutoffs of all
>the stages are much lower. Where does the bump come from? Is there a
>specific law that defines this?
>
>I am trying to find a way to filter a .wav through the filter and look
>at the voltage output. Is this possible to do in pspice? If not, do
>any other spice packages allow that?
>
>Thanks
>D.
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